The former Crystal Palace boss had been free to join any side after he opted against renewing his contract with the Eagles at the end of the 2025/26 season.
Glasner is set to replace Vítor Pereira at the City Ground on a three-year contract and has reportedly already discussed transfer plans with Forest ahead of the new season.
The Austrian mentor enjoyed an impressive spell with the Eagles, guiding the club to last season's UEFA Europa Conference League title following the historic FA Cup triumph in 2025 and subsequent FA Community Shield win.
He will become the fifth managerial change at Forest in the past 12 months as the Tricky Trees attempt to launch a long-term project under the 51-year-old.
Glasner will have some funds to work with in the market with the imminent big money transfer of England midfielder Elliot Anderson to Manchester City.
Manchester City have completed the signing of England midfielder Elliot Anderson from Nottingham Forest in a transfer worth 116 million pounds, making the 23-year-old the most expensive British player in football history.
Tottenham Hotspur have officially announced the acquisition of Portugal international midfielder Mateus Fernandes from West Ham United ahead of the 2026/27 season.
Senegal striker Nicolas Jackson is set to return to Chelsea after Bayern Munich decided against signing him after last season's loan spell in German Bundesliga.
Newcastle United midfielder Sandro Tonali is expected to sign for Tottenham Hotspur ahead of the 2026/27 season, with his medical set for Thursday in London.
